Hygrometer apparatus



E. A. ILEMAN HYGROMETER APPARATUS Filed Feb. 10, 1925 March 27, 1928.

, rflw/v ATTORNEYS rll moistureofthe wet bulb from' Patented Mar. 27,1928.

UNITED I-STATEQS PAT T oFF cE.

EMIL AUGUST ILEMAN, or ouniiivsavnw roan, AssIeNon 'ro Ammi ANDBUDENBERG CORPORATION, ACOBIORATION 01 NEW YORK.

nYonomE'rER APPARATUS.

Application niearebruar' 10, 1s25. Serial m. 8,161.

This invention relates to hygrometers and particularly to'hygrometersiutiliaing a wet bulb in the measurementof the moisturecontent of the air.

The object of the invention is to provide compact and eflicientmeans'for supsimple, 7 p r I liquid to the wet bulb at a temperatureconstantly the same as the temperature of the surrounding air.

Another object of I vide a combination of wet bulb and dry bulbapparatus which will position'the wet and dry bnlbsadjacent to-eachother ontheisame supporting means .while preventing the interfering withthe action of the dry bulb. I

Further objects of the invention particularly iii the construction ofthe details of the apparatus will appear from the following descriptiontaken inconnection with the accompanying drawings in which Fig. 1 isavei'tical elevation of apparatus embodying the invention with partsshown broken away and in section.

V Fig. 2 is a plan view ofthe apparatus shown in Fig. 1. p v I Fig. 3 isa vertical section view taken on the line of Fig. 1.

The embodiment of the invention shown in a the. drawings comprises atank,or main water reservoir to, be fastened in place iii any desiredmanner. as by lugs 11 and 12. WVithin the reservoir a constant waterlevel is maintained by a valve v13 which is con- 1 nected tobe openedand .closedby the rise and fall of floatl i to admit water from thesupply pipe 8 through the supply opening 8'. The reservoir 10 is ofgenerally rectangular formation and is provided at the top with aclosely fitting removable cover 0.

At one side of the reservoir 10 are mounted two hollow supports 15 and16 providing communication from below the constant 7 level of reservoir10 to aiiauxiliary tank or r wick chamber 17 the wick chamber being Thesupply the invention is to prowick chamber is extensive so that there isa very large ratio of radiating surface per cubic inch of watercontained.

sf into the main reservoir 10. This water supply. is often of differenttemperature from the temperature of the space in which d lmpoltimt toprotect the wet bulb 20v from 4 having its temperature alfected by thetemperature of the water supply. Therefore, the, supply of' water isfirst received in the m i I of water is substantially con-f antly seepng in through the valve opening.

AN scmmrrniz.

relatively large body of liquid inthe main reservoir 10 which has beenbrought near to the temperature of the space within which the apparatusis situated. From this body of water in the reservoir 10 a constantsupply is slowly drawn off through connections 15 and 16 into theauxiliary wick chamber 17 from which it is drawn upward by wick 22 andevaporated from the exposed portions of the Wick surrounding the wetbulb 20. i

'Theconnections 15 and 16 areiso posi tioned as to drawv fromthereservoir water representing the higher temperature ofthe water inthe reservoir and in the connections I 15, 16 this supply is brou htmore nearly to the room temperature. hen in the small chamber 17 therelatively large radiating surface finallybrings the temperature of thewater so near to that of the room that there is ,no substantialdifference.

tion there is in the temperature of the water in the supply pipe 8,water, at substantially room temperature will be delivered to theWlCk22. w I

The wet bulb 20 is freelyspaced from the main reservoir and thesupporting means'so that there willjbe an easy uninterrupted flow Nomatter what the rate of evaporation orwhat variaof air around it; andthe small width of the I wickchamber .17 also offers very littleresistance to the flow of air to the wick. The small narrow formation ofthe wick chamber 17 also reduces the area of water surface in whichevaporation takes place, and which would affect the rate of evaporationof the water from the wick around the bulb.

lVhile there is constant supply of constant temperature water to thewick around the bulb there is. thus also maintained econstaiit supply ofroom air to the outside of bulbs may be .fastened' in place by "a thewick giving a very accurate and precise relation between the temperatureof the bulb 20 and the amount of moisture in the air passing to thewick.

v The wetbulb 20 may be supported by a bracket 18 fastened in place atone end of reservoir 10 as shown; and this bracket may also carry thedry bulb 19 in parallel relation to the wet bulb and sufficiently spacedtherefrom to be unaffected by the moisture from the wet bulb wick. Bothof these clamp 21. I

In this Way within compactapparatus the wet bulb is supplied with acontinuousflow of air and moisture at the same temperature,

while the dry bulb. is conveniently carried in any dcsireda'elation to;the wet bulb structure. From the dry bulb 19 and wet bulb 20 theflexible connections 24 and 25 lead to the indicating ori'ecordinginstru mer t located at any desired point. e The ap'- paratus of thisinventioii'ismounted in any desired location in the space where theinoisture is being measured, the wet and dry bulbs being supported fromthe reservoir tankso that it is only necessary to connect up the watersupply pipe 8.

I'claim:

1. In axhygrometer apparatus, means forming an elongated horizontalchamber for receiving a wet bulb'wick, the upper horizontal side of saidchamber having an elongated horizontal opening and the width thereofbeing slightly greater than the thickness of the wick exten'din gtherethrough, neans for supporting an elongatedwet bulb so that itsubstantially overlies and is parallel to said" opening whereby the wickmay substantially completely cover the wet bulb, and means permittingliquid to be supplied to said chamber.

"2. In 'hygrometer apparatus, a main reservoir, an auxiliary, chamberhaving an elongated horizontal opening, a wet bulb overlying saidhorizontal opening and hav. 'ing a, wick extending downwardly through.

said opening into said chamber, and means for supporting said reservoirand chamber in operative relation whereby. communication is hadtherebetween, and said chamber and opening lea-ding therefrom beingrelatively narrow so as to'fit said wick compara tively, closely and ofrelatively small cubical contents in comparison to that of saidreservoir. V

3. In a hygrometer apparatus a main constant level reservoir, a wet bulband a wick therefor havingan upper portion surroundingthe bulb and alower portion receiving a supply of liquid and carrying it to said.upper portion, means for supplying liquid to said reservoir. tomaintain'its leveltherein, an auxiliary chamber for the lower portion ofsaid Wet bulb wick, said auxiliary chamber being relatively small andnarrow so as toreduce its cubical contents in comparison with itssurface area, and conduit connecting means between said auxiliarychamber and said main reservoir for feeding liquid to said wick son thatthe exposed surface of the liquid supply will be reduced and the liquidfed to the wick will be brought substantially to the temperature of the,surrounding atmosphere irrespective of variations in the temperature ofthe supply'to said reservoir. o 1

4. In a hygrometer apparatus a'main constant' level reservoir, a wetbulband a wick therefor having an upper portion surround-e ing the bulb anda lower portion receiving a supply of liquid and carrying it to saidupper portion, means for supplying liquid to said reservoir to maintainits level therein, an auxil ary chamber for the lower portion of saidwetbulb wick, said auxiliary chamber being relatively small and narrow j soas to reduce its cubical contents in comparison with'its surface areaand permit free flow of air upward to the exposed portion of the wick,and conduit connecting means between said auxiliary chamber and and aWet bulb adjacent to said dry bulb and having a wick with its upperportion surrounding said wet bulb and its lower portion receiving asupply of liquid and car- '100 5. In a hygroineter apparatus a dry-bulbrying it to said upper -portion,"a main con-- I stant levelreservoir andineansfor supplying liquid to said reservoir to maintain its leveltherein, an auxiliary chamberfor the lower portion of said wet bulbwick, said;

auxiliary chamberbeing relatively small and narrow so as to reduce tscubical contents 1n" comparison with its surface area and permit freeflow of air upward to the exposed portion of the said wick withoutaffecting said adjacent dry bulb, and conduit connecting m'eansbetweensaid auxiliary chamber and said main reservoir-spacing said chamber andreservoir apart and feeding liquid tosaid wick so that the exposedsurface of the liquid supply will be reduced and the liquid fedtothewick will be brought substantiallyto the temperature of the surroundingatmosphere irrespective of'variations in the tei'n" perature'of thesupply to said reservoir.

EMILMAUGUST, ILEMAN,

